Irrlicht Engine

Posted: **Sat Feb 02, 2008 5:12 pm**

I noticed, while attempting to use the terrain scene node with ODE, that there isn't actually any way of telling how large the terrain is (as far as I can tell). I've only added one new member, since apparently the terrain scene node only supports square terrains, which I suppose is an artifact of the LOD system.

You can add getTerrainSize() to the terrain scene nodes with the following additions:

In CTerrainSceneNode.h:

Code: Select all

		//! Returns the number of points in the heightmap (in the X/width and Z/depth directions).
		virtual s32 getTerrainSize( ) const;

In CTerrainSceneNode.cpp:

Code: Select all

	s32 CTerrainSceneNode::getTerrainSize( ) const
	{
		return TerrainData.Size;
	}

In ITerrainSceneNode.h:

Code: Select all

		//! Returns the number of points in the heightmap (in the X/width and Z/depth directions).
		/** PATCH - NOT PART OF IRRLICHT 1.4 RELEASE.
		Returns the length of one side of the square terrain.
		*/
		virtual s32 getTerrainSize( ) const = 0;

Rebuild & enjoy.

Posted: **Sat Feb 02, 2008 6:47 pm**

If you are trying to get the physical dimension of the terrain that is rendered, you can use getBoundingBox() to get a bounding box that encloses the terrain. You can then get the extents of that box to find the size of the terrain in the X and Z directions.

If you use the method that you show here, you need to calculate the dimension given a few different scale factors.

Travis

Posted: **Sat Feb 02, 2008 11:49 pm**

I was trying to get the number of vertices in each direction. I think that this is what this returns. Am I incorrect?

Posted: **Sun Feb 03, 2008 3:36 am**

Yes, that is what your code does. I don't see why that would ever be necessary, but that is what you are getting.

Travis

Irrlicht Engine

Patch to get terrain size from terrain scene node

Patch to get terrain size from terrain scene node